The Moorsom System included rules for measuring the internal volume available for cargo and passengers. Under the system two tonnages were required: first, to include the gross or entire space, except for exempted spaces, i. In order to maintain tonnage values of the same order of magnitude as previously, it was found convenient to divide the volumes in cubic feet by , i. By the early 's the Moorsom System had formed the basis for most national tonnage measurements, although due to the varying interpretations and modifications made by individual countries considerable differences arose in the application of the system.
Despite attempts to derive a uniform international interpretation of tonnage from onwards, it was not until that this was achieved in principle under the IMO International Convention on Tonnage Measurement of Ships. Exemptions included: navigational spaces, galleys, stairways, light and air spaces.
The total volume in cubic feet was divided by , i. This was the Gross Tonnage entered in the ship's Register. Deductions from GRT included: Master and crew accommodation, safety and storage spaces, water ballast tanks, allowance for propelling machinery. The resulting volume in cubic feet was divided by , i. This was the Net Tonnage entered in the ship's Register. Measurement or Shipping Ton' which was equivalent to 40 cubic feet.
Under the IMO International Convention on Tonnage Measurement of Ships , which initially entered into force on 18 th July for new ships and which fully entered into force on 18 th July for all ships except warships, ships of less than 24 metres in length and ships solely navigating: the Great Lakes of North America and River St. The method of determining the Gross and Net Tonnages is prescribed by formula as follows The 'Gross Tonnage' and 'Net Tonnage' figures as determined from the above formulae are to be those quoted on the ship's International Tonnage Certificate Searchable index include more than nautical topics in expected MMD written and oral exams with pinpoint answer, making our site a good all around tool for MMD exams preparation.
The collaborative and constantly updated encyclopedia is free for everyone to use and perfect for candidate who are preparing for MMD written or oral exams such as Second mate, Chief mate or Masters. In addition to our massive store of reference material for fellow mariners, we are providing online bookings for various Maritime courses in maritime institutes across India. Post Your Stuff. Book Course. About Us. In those cases capacity is described by volume, quantity of cars car equivalent units, or CEU or containers twenty-foot equivalent units, or TEU.
Any comments on this article can be e-mailed to the Gard News Editorial Team. Home Articles Insight. Rate this article:.
Tonnage measurement of ships. Most read Insight articles Load lines Why do ships float?
0コメント